Old contacts - MS backup?

[Volker680]

Hi, 

As of this morning, I find my o365 contacts all appearing to be old, as if an old backup was restored.

Does anybody know whether MS installed an d backup last night?

Thank you!

Volker

[#2]

One thing I just realise, it seems to be a mix of old and new contacts...

[#3]

@Volker680 Ackermanaot 

PC folder backup automatically syncs your Desktop, Documents and Pictures folders on your Windows PC to your OneDrive cloud storage. Your files and folders stay protected and are available from any device.

[#4]

@ackermanaot1010, Thanks for your reply!

However, the problem is that I did not delete/chage my contacts, they simply got "reset" to an older version, and some were even deleted.

Does anybody know how to contact MS O365 support? Is there an email address?

I am afraid I have lost many contacts, and the ones I have in my account seem to be some very old ones, which I had deleted many months or even years ago...