Product: CommuniGate SPEC 8.1.1

Release Date: 21 September 2026

Download: https://support.mailspec.com/en/downloads/81-spec

In this release:

• IMAP: Conditional store functionality is disabled by default (i.e., opt-in)

• IMAP: When enabled, Conditional store functionality only applies to mailboxes using the sliced format

• IMAP: Conditional store functionality can be enabled for other mailbox formats using a startup parameter (--CondstoreLegacyFormats YES)

• Calendar: Fixed an issue with "Accepted" responses sent by Pronto! with invites from Apple Calendar

• Bug Fix: Fixed an issue where the CPU usage could grow unexpectedly due to conditional store usage with legacy mailbox formats

• Bug Fix: Fixed an issue where the Conditional store functionality could result in a CommuniGate service crash

  
  

Please Note: A bug introduced in the initial build of 8.1.0 could potentially cause the service to crash. If you downloaded/installed 8.1.0 before June 23, 2026, please install 8.1.1.

Please Note: CommuniGate SPEC 8.1.x, 8.0.x, and CommuniGate Pro each require different license keys. If you have any questions regarding the status of your subscription/license, or you would like to request keys, please open a sales ticket here.