DeltaSync
DeltaSync is a proprietary Microsoft communications protocol for synchronizing web services with offline clients.[1] Windows Live Hotmail is exposed to offline clients using DeltaSync; 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, and notes synchronization. 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.
Contents
History
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.[2] However, in May 2008, Microsoft stated that it would be "postponing the transition deadline previously announced" to allow customers more time to "evaluate alternative solutions".[3] In June 2009, Microsoft announced that WebDAV support would finally end on 1 September 2009.[4]
Format details
The DeltaSync compression code produces a stream with a four byte magic number of "HU01", followed by the stream header.
HU01 header
| Offset | Description |
|---|---|
| 0 | "HU01" magic number |
| 4 | Header size (should be greater than or equal to 28) |
| 8..31 | Unknown |
| 32 | Decompressed file size |
Following this header is a series of compressed data blocks with the following structure.
SCBH header
| Offset | Description |
|---|---|
| 0 | "SCBH" magic number |
| 4 | Header size |
| 8 | Decompressed block size |
| 12 | Block CRC? |
| 16 | Compressed block size |
This is followed by 256 bytes of decompression table and finally the actual compressed data.
Discontinuation
Since Microsoft migrates the outlook.com mail to the structure based on Office 365, the DeltaSync protocol will be discontinued in late June 2016, and the mail will not be synced via Windows Live Mail start from that time. [5]
See also
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ WebDAV no longer supported on Hotmail
- ↑ Responding to Customer Feedback – Disabling DAV
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Microsoft Office Outlook Connector
- Daniel Parnell is reverse engineering DeltaSync
- Daniel Parnell has released the source for DeltaSync decompression code
- another person reverse engineering DeltaSync
- POP3 access to Windows Live email in selected countries
- Get Contacts and Mails with DeltaSync
- Java implementation of the DeltaSync protocol which so far implements synchronization of folders and messages
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