Having trouble connecting to your email from Outlook on your desktop? Follow these steps to let Outlook diagnose and fix errors in your Outlook mail profile that might be causing the issue. There is no limitation on the size and version of the original OST file for the online service. If you're using an Exchange email account, you can delete the Fix Outlook and Office 365 Errors 2025 offline Outlook Data File (.ost) and Outlook will recreate the offline Outlook Data File (.ost) the next time you open Outlook. These same steps will allow you to quickly and correctly import a PST file when migrating from/to Outlook 2016. The online import of the Outlook 2016 PST file is completely similar to the 2019 versio

If you do not know where the .pst file is located, follow the steps in How to locate, move, or back up your .pst file. Describes an issue in which the file size limits of .pst and .ost files are larger in Outlook 2010 and Outlook 2013. It is located in the folder of your original Personal Folders (.pst) file. If you can't start the Inbox Repair tool automatically or manually, you may try to repair your Office application. At a higher level, the more visible changes that you see involve folders and message

Also, this specific kind of situation is rare, and it will always be entered in the ScanPST log file. Hello, tonycable, I recommend launching the Inbox Repair tool (Scanpst.exe). You can download the demo version & check the preview of your corrupt PST fil

To install the latest Windows and Office updates, click the link below. For persistent issues, use FixTechGuide’s automated tools to perform deep diagnostics and security checks. Stay updated, back up regularly, and enjoy uninterrupted productivity in your Outlook workspace. Certain antivirus tools inspect SSL ports and block push notifications. Fix Outlook and Office 365 Errors 2025 Whitelist Outlook in your antivirus/firewall settings to restore live sync. If sync logs display "Completed," Outlook is connecte

As a rule of thumb, it's safer to assume that the limit of SMTP addresses in the proxyAddresses attribute is approximately 300 addresses to leave room for future growth of the object and its populated attributes. It isn't possible to determine exactly how many entries an attribute can hold in Microsoft Entra ID, for example, how many SMTP addresses can fit in the proxyAddresses attribute. The amount depends on the size and multiplying factors of all the attributes populated in the objec

If Outlook opens, whitelist the Outlook process in your antivirus settings. Download the tool from Microsoft and run the Outlook diagnostic to auto-detect server and account issues. This often resolves startup errors caused by configuration issues. Open Control Panel → Programs and Features → Microsoft Office → Change → Quick Repai

Interestingly, during this time I was unable to connect to OWA using a different mailbox on the affected client computer. Every affected user has recently been upgraded to Windows 7 64-bit, while I have not had any 32-bit client users report any similar issue. So all signs are pointing to the individual client but I can’t figure out what it i

Used the Recovery tool for Fix Outlook and Office 365 Errors 2025 Outlook to restore the items to a PST from a backup of the old OST files. This worked well although only the agenda item are restored, not the attachments and extra information field. In the Folder Pane, you might see a folder named Recovered Personal Folders that contains your default Outlook folders or a Lost and Found folde

Fixing corrupted Outlook PST files without losing data is achievable with the right tools and techniques. Start with ScanPST.exe for minor issues, escalate to third-party software for complex corruption, and use manual methods as a last resort. Regular maintenance and backups are key to preventing future issues. By following these steps, you can restore access to your Outlook data efficiently and securely, ensuring uninterrupted productivity. ScanPST mostly validates and corrects errors in the internal data structures of a .pst file. Therefore, structures such as BTrees and reference counts, are Fix Outlook and Office 365 Errors 2025 checked and repaired as necessar

If ScanPST determines that a specific block of the structure or table is unreadable or corrupted, ScanPST removes it. If that block was part of a specific item in Outlook, the item will be removed when it is validated. For instructions about how to unhide files and folders, see your operating system documentation. This probably doesn’t help, unless it saves you time by preventing you from looking in the wrong direction. I’ve got a user with a very large 3gb PST file, which has become corrupted. You may not expect this behavior, but the removal of the item is appropriate given the circumstance

Per the article below I updated the Ethernet drivers on the the server to the most recent version and the MTU was automatically set to 1500. Not sure why only certain machines were affected but at this point I’m keeping my fingers crossed. Turning off cached Exchange mode works, but the connection seems to be spotty as Outlook will freeze up after a while. Rebooting, deleting the OST and/or mail profile does not have any effect. Things work well for a number of days or weeks but the problem reoccurs eventually. For those utilizing the classic (old) Outlook application, this section addresses issues specific to this versio