DEVONtechnologies has updated all three editions of (Personal, Pro, and Pro Office) and  to version 2.9 with a completely rewritten synchronization engine. Paving the way for the upcoming 2.0 release of  on iOS, the new sync engine works both on local networks as well as with Internet-based services such as Dropbox or WebDAV servers. According to this , it syncs up to 688 times faster than DEVONthink 2.8 and consumes up to 80 percent less bandwidth, less RAM, and less computing power. However, the new sync engine is not backward-compatible, so you will need to delete existing sync stores and resynchronize your databases.
All four editions also change the default plain text font to 11 point Menlo Regular, improve the handling of selections with thousands of items, improve handling of tab stops of plain text views, and fix a glitch in the Info panel. The three editions of DEVONthink now scale thumbnails of very long PDF pages to width, improve ScanSnap/ExactScan support, and add conversion of .emlx email messages to HTML and formatted notes. Starting with version 2.9, all three editions of DEVONthink and DEVONnote require OS X 10.9 Mavericks or later. (All updates are free. DEVONthink Pro Office, $149.95 new,; DEVONthink Professional, $79.95 new, ; DEVONthink Personal, $49.95 new, ; DEVONnote, $24.95 new, ; 25 percent discount for  on all editions of DEVONthink and DEVONnote. 10.9+)