[RFC] 7162 [Name] IMAP Extensions: Quick Flag Changes Resynchronization (CONDSTORE) and Quick Mailbox Resynchronization (QRESYNC) [Capability name] CONDSTORE (L) [Agorum Core] no [Apache James] yes [Archive​opteryx] yes [Axigen] no [Citadel] no [Communigate Pro] no [Courier] no [Cyrus] v2.3 [DBMail] no [Dovecot] v1.2 [GMail] yes [IceWarp] no [Isode] yes [Kerio Connect] no [MDaemon] no [Microsoft Exchange] no [Oracle] v7.0 [UW-IMAP] no [Zimbra] yes [WinGate 7] 
yes