There is a formal minimum requirement that we need to check when connecting to Office 365 Mailbox.The supported versions are: You can read more information about the software requirements, in the article: Software requirements for Office 365 Enterprise and Office 365 Midsize Business The Office 365 desktop apps consider as crucial software component that need to be installed on each of the desktops that access Office 365 services (such as Exchange Online and Share Point Online).The “cause” of synchronization issues can classify by using the following categories: A. The symptoms of synchronization problems relating to communication line could be: This part is a little bit tricky Q – How can we identify corrupted mail items that cause synchronization problems?
We try to use a couple of tricks (usually turn off and turn on windows), but no luck.In this section, we review to optional causes for Outlook synchronization problems. Desktop Hardware As mentioned before, when using the Exchange Online services, the synchronization process is created using WAN infrastructure (communication over the public network).In the next section, we will review the optional solutions for each of the causes. Synchronization problem could be caused by a communication line that it’s not “wide” enough or overloaded communication line.When using the term “Exchange Mailbox”, we are using an “alias” for a Database that hosted on the Exchange server.We can describe the OWA (Outlook Web Application) mail client as a “viewer” for the data that stored in the Exchange database, and the Outlook mail client as a “viewer” for the database (OST File) that stored on the user desktop (Hard drive). WAN environment: When using a local Exchange Server (on-premises), Outlook synchronizes data to and from the Exchange Mailbox, by using a local LAN infrastructure.