PC DOS: 4096 Is Maximum Number of Inbox Entries

Last reviewed: September 30, 1994
Article ID: Q119088

The information in this article applies to:

Microsoft Mail for PC Networks, MS-DOS workstation, versions 3.0 and 3.0b

The maximum number of Inbox entries in the MS-DOS client and the Macintosh client of Microsoft Mail for PC Networks is 4096.

This limitation is due to the size of the delete bit map in the .KEY file. The .MBG file contains deleted and active mail headers. The delete flag is not maintained in the .MBG file but in the matching .KEY file. Each .KEY file contains a 512-byte bitmap of deleted headers in the corresponding .MBG file. Thus, the maximum number of messages that can be stored in the Inbox is:

   512*8=4096

The Windows client and the Presentation Manager client have a limit of 5400 messages in the Inbox folder.

Additional reference words: 3.00 3.00b 3.20
KBCategory: kbusage
KBSubCategory: MailPCDOS

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Last reviewed: September 30, 1994
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