Stellar Knowledge Base

Auto Split of Folders

  June 1, 2021    44 views

A large number of mail items in each folder may impact the performance of Outlook and Exchange database. This may also lead to synchronization errors and corruption.

According to Microsoft, you can store up to 100,000 mail items per folder and up to 5,000 items per Calendar to ensure optimal performance and avoid corruption issues.

Stellar Repair for Exchange intelligently and automatically saves up to 90,000 mail items per folder while saving the mailboxes and items in PST format.

The software auto-splits the large mailboxes and folders based on date and time. It adds an extension _earlier” at the end of the folder name. You don’t need to perform any action for this.

Following table shows Microsoft’s recommendation and the number of items Stellar Repair for Exchange automatically saves per folder while exporting the recovered mailboxes to avoid corruption and performance issue.

PST file Stellar Repair for Exchange splits and saves up to 90,000 mail items per folder while saving the mailbox in PST file format.
Live Exchange The software auto-splits and saves up to 900,000 mail items per folder while exporting the mailboxes or items to the live Exchange Server. 
Office 365 It saves up to 900,000 mail items per folder during Office 365 export under Microsoft’s recommended limits.

To know more, refer to Mailbox Folder Limits recommended by Microsoft .For more help, leave a comment down below.


User Comments



Stellar Repair for Exchange Stellar Repair for Exchange is most recommended software by MVP’s. It repairs corrupt Exchange Database (EDB) files & restores mailbox contents like emails, attachments, contacts, calendars in Outlook PST files.

Learn More


Related Articles