How Can I Change the OST File Name? Proven Solutions

[WilliamsWelsh9]

Renaming an OST file isn't as simple as right-clicking and hitting "Rename" in File Explorer. Since OST files are directly linked to your Outlook profile, improper renaming can break your email configuration and put your data at risk. But don't worry — here are proven ways to do it safely.
The safest method is through Outlook's Account Settings. Go to File → Account Settings → Data Files, note your OST file location, close Outlook completely, rename the file, and reopen Outlook. It will auto-generate a new OST and re-sync your data. Alternatively, you can remove and re-add your email account, which forces Outlook to create a fresh OST file with a cleaner name.
Always ensure Outlook is fully closed before renaming, and back up your OST file beforehand. If your OST file becomes corrupt or inaccessible during this process, the Cigati OST File Recovery Tool (https://www.cigatisolutions.com/ost-file-recovery-tool/) is a reliable solution to recover emails, contacts, and calendar data with ease.
For a complete step-by-step guide, visit the How Can I Rename OST File in Outlook (https://www.cigatisolutions.com/blog/rename-ost-file-in-outlook/) blog for detailed instructions and expert tips.

[Norvemill]

I came across this older discussion and wanted to add that renaming an OST usually works fine as long as Outlook is fully closed first. I’m curious if anyone here has tried creating a new Outlook profile instead of renaming the file. In some cases, that’s solved sync issues for me with less hassle. Anyone else had better luck with one method over the other?

[Famousbr]

If you ever need to clean up file names before working with Outlook data, I’ve had good luck using renamer.io (https://renamer.io) to batch-rename large sets of files without messing anything up. For the OST itself, your steps look fine as long as Outlook is fully closed. I’ve found that reopening Outlook after the rename usually prompts it to rebuild things without any drama.