sync hotmail contacts some contacts disappear


I am using eM client for E-mail and contacts. I am also using a hotmail account, only for sync contacts between my home computer and Windows Phone. This worked for some years, but recently I have problems with syncing the contacts. Some of the contacts don’t show up in the contact list of the eM Client contacts. They are present on the Phone and on the Hotmail account.

I tried to add a new address on the Phone and the sync worked, so the address appeared on the home computer. I also tried to add an address on the home computer, this address also showed up on the Phone. So syncing seems to work, however some addresses on the Phone as well as on the Hotmail account don’t show up on the home computer.

I could not find any difference between the contacts.

Do you know what causes this behavior?

Kind regards,

Rob Walters