High Quality Content by WIKIPEDIA articles! DeltaSync is a proprietary Microsoft communications protocol for synchronizing web services with offline clients. Windows Live Hotmail is exposed to offline clients using DeltaSync, and Outlook Connector and the Windows Live Mail client use it for offline access. Microsoft is pushing for this protocol instead of POP3 or IMAP4 for supporting various advanced features like contacts, calendar, notes synchronizing. Using the DeltaSync protocol, Microsoft intends to provide a common platform for any compatible device to implement a client which can two-way synchronize mail, contacts, calendar and notes. In January 2007, Microsoft announced DeltaSync as the replacement for WebDAV. In April 2008, Microsoft sent an email warning that WebDAV would no longer be supported after 30 June 2008. However, in May 2008 Microsoft stated that they would be "postponing the transition deadline previously announced" to allow customers more time to "evalute alternative solutions". In June 2009 Microsoft announced that WebDav support would finally end on 1 September 2009

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