SYNCING.NET Personal Edition: Keep Outlook and Your Folders Identical on Two or Three PCs
SYNCING.NET Personal Edition is a $59.99-a-year Windows program that keeps Microsoft Outlook (mail, contacts, calendars, tasks) and the folders you choose identical on two of your own computers, or three for $89.99 a year, without an Exchange server or a cloud drive. The PCs send each other only the changes, peer-to-peer and encrypted, in the background.
If you've ever opened your laptop at a client's office and found that the appointment you booked on your desktop last night isn't there, you know the problem it solves. Free Outlook.com or Microsoft 365 accounts sync on their own, but a plain POP or IMAP mailbox with local PST files lives on one PC. SYNCING.NET copies those PST-based folders, and ordinary Windows folders, between your machines as you work.
Quick facts
- Version: 6.5.0.4124 for Windows, dated May 2, 2026 (Mac client 6.0.16.0, iOS app 6.9.5, Android app 6.9.4)
- Developer: Buildway Technology LP, London
- Platform: Windows; Outlook sync needs desktop Outlook on each PC
- What it syncs: Outlook e-mail, contacts, calendars, tasks and other Outlook folders, plus Windows folders
- Limits: up to 2 Outlook groups, 10 sync folders and 300 Outlook folders
- Security: 256-bit AES encryption end to end, 1024-bit RSA authentication between your PCs
- Price: $59.99 per year for 2 PCs, $89.99 per year for 3 PCs (auto-renewing subscription)
- Trial: 14 days, no feature limits; you enter the license key in the same installation afterwards
- What we checked: installer SYNCING.NET.exe version 6.5.0.4124 (8.4 MB), digitally signed by Buildway Technology LP, downloaded from the vendor on November 8, 2026; order page price $59.99 a year for 2 PCs and $89.99 for 3 PCs, both marked auto-renewal, on November 8, 2026. We didn't run a sync between two PCs.
Before you buy: check your Outlook version
The vendor's requirements list Outlook 2003, 2007, 2010, 2013, 2016 and 2019 (32- and 64-bit) on Windows 10, 8 and 7, and say Office apps installed from the Windows Store are not supported. Outlook 2021, Outlook 2024, Microsoft 365's desktop Outlook, the "new Outlook" for Windows and Windows 11 aren't named. The Windows client itself is current (a signed May 2026 build), but if you run a newer Outlook, use the full 14-day trial on your own setup before paying. The subscription renews automatically each year.
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Overview
SYNCING.NET is an old name in Outlook sync. It started at ASBYTE GmbH in Germany and is now developed by Buildway Technology LP, which moved its store to PayPro Global in November 2024 and still ships updates: the Windows client was rebuilt in May 2026, and the Android and iOS apps got Smart Download and external-editing features in April and May 2026. The vendor says it releases a new version roughly every two to three months.
The idea is simple. You install SYNCING.NET on each PC and sign in with one SYNCING.NET account. You then create an Outlook group (the Outlook folders to share) and sync folders (Windows folders to mirror). From then on it runs silently in the background and sends each change straight to your other PCs as it happens. Only the changed data travels, not whole files, so after the first full copy the updates are quick.
The vendor's device mock-up: the SYNCING.NET window on Windows browsing a synced folder of images and PDFs, with the same folder open in the tablet and phone apps. It shows the file side, not the Outlook sync.
Features
Outlook sync without Exchange
SYNCING.NET Personal Edition mirrors your Outlook e-mail folders, contacts, calendars and tasks between PCs, with no Exchange server, hosted mailbox or Google account in the middle. You pick each Outlook folder to include, up to 300 in total across 2 Outlook groups. It works with both PST files (personal folders) and OST files from an Exchange account, and can even keep folders from two Exchange servers in step. Different Outlook versions can sync with each other, such as Outlook 2007 on an old laptop and Outlook 2016 on the desktop.
Folder sync with no cloud copy
SYNCING.NET Personal Edition also mirrors up to 10 Windows folders between your PCs, with no limit on file size or file count. The files stay on your own disks; there's no online storage account to fill up. You can cap the bandwidth it uses and set folder size limits, and pause syncing with two clicks when you need the connection or the CPU for something else.
Store and forward when the other PC is off
SYNCING.NET normally needs at least two of your PCs online at the same time, because it copies changes directly between them. Turn on Store and Forward (Configuration, Options, General Settings) and the last PC online leaves its encrypted changes on the vendor's server until your other PC comes online and collects them. The server holds up to 500 MB of changes per computer, at most 50 MB per file, for 7 days, and deletes each batch once it's been downloaded.
Encryption you don't have to set up
SYNCING.NET encrypts everything it sends with a 256-bit AES session key, and each PC proves its identity with its own 1024-bit RSA key pair before any data moves. Data from an unknown machine is simply ignored. The vendor's server stores your account and group settings and the public keys, but your mail and files live only on your computers (plus any store-and-forward queue, which is encrypted too).
Free phone and tablet apps
SYNCING.NET's free Android and iOS apps sync files, contacts and calendars with your Outlook PCs over the same peer-to-peer network. Since the 2026 updates they can download files only when you open them (to save space on the phone) and hand Word, Excel and text files to other apps for editing, with the changes synced back.
Benefits
- Your data never sits in someone else's cloud. For anyone who keeps client mail in local PST files for confidentiality reasons, that's the main reason to pick this over a cloud mailbox.
- No server to run. A small office or a one-person business gets Exchange-like shared calendars and contacts between its own machines without paying for or maintaining a server.
- It just runs. After setup there's nothing to remember: no "sync now" button, no USB stick, no copying PST files by hand and wondering which one is newer.
Real-World Uses
- Desktop at the office, laptop on the road. You file mail and book meetings on the desktop all day; the laptop you take to the client has the same inbox folders and calendar when you open it.
- Working from home in the evening. The project folder and the Outlook tasks you edited at home are on your office PC when you arrive the next morning.
- A POP3 mailbox on two machines. Mail downloaded into a PST on one PC appears on the other, which POP3 on its own can't do.
- Replacing an old PC. Install SYNCING.NET on the new machine, join it to your groups, and Outlook folders and files flow over without exporting and importing PSTs.
Who It's For, and Who Should Skip It
It's for one person with two or three Windows PCs who keeps Outlook data in local PST files (POP3 or IMAP accounts) and wants calendars, contacts and mail folders identical everywhere, without moving to a hosted mailbox.
Skip it if:
- your mail is already in Microsoft 365, Outlook.com, Exchange or Gmail. Those accounts sync themselves across PCs and phones, so you'd be paying for something you already have.
- you use the new Outlook for Windows or Office from the Microsoft Store. The vendor doesn't support the Store versions, and its lists don't name the new Outlook.
- you need Outlook sync on a Mac. The Mac and Linux clients sync files only.
- several people need to share mailboxes or folders. That's the Business or Manager Edition.
- you only need files, not Outlook. The FileSharing Edition is cheaper, and a general file-sync tool may do.
Usage Guide
- Prepare your data. Back up your PST files, and decide which PC holds the master copy of your Outlook folders: that's the PC that creates the Outlook group.
- Install on the first PC. Run SYNCING.NET.exe (8.4 MB). It may ask to install the .NET Framework, which is normal. Create your SYNCING.NET user account.
- Create an Outlook group. Pick the Outlook folders to share: Inbox, Calendar, Contacts, Tasks and any others.
- Create sync folders. Add the Windows folders to mirror. They must be on a local disk or a removable drive.
- Install on the other PC. Sign in with the same account and join the group. SYNCING.NET then asks how to bring in the group's Outlook folders: Create new Outlook folders adds them as a separate folder tree next to yours, while Import into existing folders replaces same-named folders (Contacts with Contacts) and keeps the old ones in a "Backup_" folder tree you can delete later.
- Let the first sync finish while both PCs are online. Preparing large Outlook folders can take from a few minutes to hours the first time; after that only changes move.
- Turn on Store and Forward if your PCs are rarely on at the same time, and enter your license key before the 14-day trial ends.
Where it falls short
- No network drives. SYNCING.NET can't use network shares or NAS drives as sync folders, only local and removable disks.
- Open files are skipped. A file that another program holds open can't be synced until it's closed.
- Internet required even on one network. The PCs must be online to reach the SYNCING.NET service; it uses the fastest route, including the local network, but it won't sync two PCs that are only connected to each other.
- Dated documentation. The downloadable user guide is from 2015 and lists Outlook 2000 to 2007; the newer requirement list stops at Outlook 2019.
- Error messages to expect. The vendor's FAQ has a long list of MAPI errors (corrupt store, store full, not enough resources), "duplicate stores detected", and duplicate e-mails after installing, so a damaged or oversized PST needs fixing before you sync it.
- Linux client is old. The Linux build on the download page is from 2016.
What Users Say
SYNCING.NET has very few public reviews: none on Trustpilot or Capterra, and the professional reviews that exist covered much older versions.
Google Play (the companion Android app)
The Android app is rated 3.7 out of 5 from 24 phone reviews. These are about the mobile app's sync with Outlook PCs, not the Windows program on its own.
A Google user, August 30, 2017: "Finally, it is possible to sync multiple calendars and contacts with other mobile Android or iOS based devices or with Microsoft Outlook on Windows PCs! No additional accounts or sync software like Samsung KIS or iTunes/iCloud is required."
A Google user, December 2, 2019: "I like it"
A Google user, November 3, 2022: "Outlook not working properly"
AlternativeTo and press
The single user comment on AlternativeTo, from user medalark88 in October 2010, liked the trial and the internet sync without online storage, but didn't buy because of the licensing at the time: "Problem is you have to purchase 1 licence per PC so you need to buy it at at least twice". Today's Personal Edition covers 2 or 3 PCs in one subscription.
PCWorld reviewed the older Home Edition (then $150 for three PCs) and found it solved the problem of keeping Outlook in step across PCs well, while calling it pricey, warning that the first full sync of a large folder is slow, and advising care with the merge options during setup. That advice still applies to the first sync today.
The pattern: people who need Outlook sync without a server like that it works with no cloud account, and the complaints are about price, first-sync setup and Outlook problems on some setups. With this little feedback, the 14-day trial is your real review.
Comparisons
SYNCING.NET vs moving to a hosted mailbox
A Microsoft 365, Outlook.com or Exchange mailbox syncs mail, calendar and contacts to every PC and phone with no extra software. If you're willing to move your mail there, that's the simpler path. SYNCING.NET is for people who want to keep POP3/IMAP mail in local PST files, or who don't want their mail on a third-party server.
SYNCING.NET vs a cloud drive for files
OneDrive or Dropbox keep a copy of your files online and sync any folder inside them. SYNCING.NET keeps files only on your own machines and syncs folders wherever they are on local disks, but it can't sync network shares and it needs both PCs (or the 7-day store-and-forward queue) to pass changes along.
Editions and Pricing
| Edition | Price per year | Computers | What it adds |
|---|
| Personal Edition | $59.99 (2 PCs), $89.99 (3 PCs) | 2 or 3, one user | Outlook and folder sync between your own PCs |
| Business Edition | from $94.99 (2 PCs) to $374.99 (10 PCs) | 2, 3, 5 or 10 | Sharing with up to 50 peers, individual user rights |
| Manager Edition | $179.99 | 1 (the administrator) | Full user-rights management, extra administrators |
| FileSharing Edition | from $49.99 (3 devices) | 3, 5 or 10 devices | Files only, across desktop and mobile |
Personal Edition prices are the order-page prices we saw on November 8, 2026; the other editions' prices are from the vendor's shop page, excluding sales tax. Every edition is a yearly subscription that renews automatically. Choose the number of PCs at checkout:
Buy 2 PCs ($59.99/year)Buy 3 PCs ($89.99/year)
FAQs
Does SYNCING.NET work with Microsoft 365 or Outlook 2021?
SYNCING.NET's published requirements stop at Outlook 2019, and its FAQ says it supports all Outlook versions from 2003 on. Outlook 2021, 2024 and Microsoft 365 aren't named, and Store-installed Office isn't supported. Test your exact Outlook during the 14-day trial.
Can SYNCING.NET sync two PCs on the same home network without internet?
No. SYNCING.NET needs an internet connection on each PC, even when both are on the same LAN. When they are, it sends the data over the local network instead of the internet, but the PCs still have to reach the SYNCING.NET service.
Does SYNCING.NET store my e-mail on its server?
Only temporarily, if you turn on Store and Forward. SYNCING.NET's server otherwise keeps your account and group settings; your Outlook data and files stay on your PCs. Queued changes are encrypted, capped at 500 MB per computer, and deleted after download or after 7 days.
Can I sync a folder on my NAS?
No. SYNCING.NET only accepts folders on local hard disks and removable drives as sync folders, not network shares or NAS drives.
Can I move my SYNCING.NET license to a new computer?
Yes. SYNCING.NET has how-to guides for moving a license key to another computer and for removing an old PC from your sync folders and Outlook groups when you replace it.
Will I lose data if I uninstall SYNCING.NET?
No. SYNCING.NET's own guide says no data is lost when you uninstall it or delete a group; your Outlook folders and files stay on each PC. Back up your PST files before the first sync anyway.
Can I sync Outlook between different Outlook versions?
Yes. SYNCING.NET can sync, for example, Outlook 2007 on one PC with Outlook 2016 on another. Outlook Express isn't supported.
System Requirements
- Windows 10, 8, 7, Vista or XP (x86 and x64), or Windows Server 2003, 2008 or 2012
- Pentium-class CPU, 800 MHz or faster; 256 MB RAM (512 MB or more recommended)
- Microsoft .NET Framework (the installer can add it)
- Internet access (broadband recommended)
- For Outlook sync: Outlook 2003, 2007, 2010, 2013, 2016 or 2019, 32- or 64-bit; not Office apps from the Windows Store
Conclusion
SYNCING.NET Personal Edition is worth $59.99 a year if you keep Outlook in local PST files on two Windows PCs and want them identical without a server or a cloud mailbox. Few tools still do that, and this one is still updated, signs its installer and encrypts everything end to end. The one reason to buy it: real-time Outlook and folder sync between your own machines with your data staying on them. The main reason not to: its Outlook support list stops at 2019, so on Microsoft 365 or a newer Outlook you're relying on a combination the vendor doesn't list, and if your mail is already in a hosted account you don't need it at all. Run the 14-day trial on both PCs with your real data before you subscribe.
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