4.1.9. Folder limits recommended by Stellar Converter for EDB

Sometimes, the EDB file gets corrupted if any of its folders have more mail than the 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 Converter for EDB 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.

Microsoft specifies mailbox folder limits for the different Live Exchange, Office 365, and PST versions. These mailbox folder limits are not permanent, they 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 Converter for EDB to limit the number of emails 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 Converter for EDB saves up to 90,000 mail items per folder in the mailbox of the PST file.
For Live Exchange	Microsoft recommends to have up to 1,000,000 mail items per folder in the mailbox of the Live Exchange Server. Therefore, Stellar Converter for EDB saves up to 900,000 mail items per folder in the mailbox of the Live Exchange Server.
For Office 365	Microsoft recommends to have up to 1,000,000 mail items per folder in the mailbox of the Office 365 server. Therefore, Stellar Converter for EDB saves up to 900,000 mail items per folder in the mailbox of the Office 365 server.

Know detailed information about the Mailbox Folder Limits set by Microsoft.