#1411 4.2.1 Updating Everything Repeatedly

[Alan Hershowitz]

Since updating to 4.2.1, all contacts and all appointments update on every sync though nothing has changed on either Outlook or Google sides. Takes 11 minutes. Win 11 Pro. Will revert to previous 4.1.x version but some users report that after the first sync the problem remains.

[bennor3814]

Probably the same or similar issue as reported here:
https://sourceforge.net/p/googlesyncmod/bugs/1410/
https://sourceforge.net/p/googlesyncmod/bugs/1408/

[Tom Geldner]

I can confirm that this is happening on my wife's computer with 4.2.1 but not on mine with 4.1.33. I'm going to try to downgrade hers to 4.1.33 to see what happens.

[Florian Saller]

I think I found the reason after several internet searches and trying out: Obviously, the hash algorithm we are using to collapse the Google Account name into an Outlook Property name changed between the .NET Framework 4.7.2 (used in 4.1.x versions and earlier) and 4.8.1 (used in the newer versions). Unfortunately we needed to upgrade to 4.8.1 to be on the Microsoft supported Framework, but there seems to be no backward compliance with the hash algorithm.
Please test the version I released here and let me know, if it works https://sourceforge.net/projects/googlesyncmod/files/Releases/4.1.34%20-%20Branch%20for%20.NET4.7.2%20fixes/

Anyway, I would advice you to upgrade to latest .NET Framework to not oppose your system any security threads. To do so, you should install the latest version (4.2.x), then Reset matches first, before resync (maybe, if possible, delete all entries first on one side, Outlook or Google, and then reset, and then start the sync again to copy over a synched version to the other side again)

[Jason King]

I’m maintaining an unofficial fork of GO Contact Sync Mod because the upstream project appears inactive.

This ticket looks very close to an issue I worked on in my fork: repeated no-change contact updates on every sync run. I also fixed deletion prompts appearing when Sync Deletion is off, plus some profile/folder persistence problems.

If you want to try it, the current "jkfix" release is here:
https://github.com/jaywking/go-contact-sync-mod-jkfix/releases

Source and issue tracker:
https://github.com/jaywking/go-contact-sync-mod-jkfix

It’s not an official upstream release, so please back up first and test carefully, but I’d be interested to hear whether it resolves the repeated-update behavior you reported.