4.10. Folder limits recommended by Microsoft

Sometimes the EDB file gets corrupted if any of it's folder has more mails than a recommended mailbox folder limit. In most cases, even if the EDB file doesn't get corrupted, having more mails than the recommended mailbox folder limit reduces  To overcome this problem, Stellar Repair for Exchange only saves the mailboxes to a recommended limit. After the limit is crossed, the software splits the folder into another folder with the same name followed by " date-time_earlier" , where "date-time" is the date and time up to which the mailbox data gets saved in that folder.

Mailbox folder limits are specified by Microsoft for the different versions of the Live Exchange, Office 365, and PST. These mailbox folder limits are not permanent, it may vary as per the version of Live Exchange, Office 365, or PST that you are using.

The mailbox folder limits that are recommended by Microsoft and are used in Stellar Repair for Exchange to limit the number of mails stored in a folder are given as follows:

For PST file	Microsoft recommends to have up to 100,000 mail items per folder. Therefore, Stellar Repair for Exchange saves up to 90,000 mail items per folder in the mailbox of PST file.
For Live Exchange	Microsoft recommends to have up to 1,000,000 mail items per folder in the mailbox of Live Exchange Server. Therefore, Stellar Repair for Exchange saves up to 900,000 mail items per folder in the mailbox of Live Exchange Server.
For Office 365	Microsoft recommends to have up to 1,000,000 mail items per folder in the mailbox of Office 365 server. Therefore, Stellar Repair for Exchange saves up to 900,000 mail items per folder in the mailbox of Office 365 server.

To know detailed information about the Mailbox Folder Limits set by Microsoft click here.