Part 2: Outlook Synchronization problems causes description In this scenario, we will need to find additional “factors” that can cause the synchronization problems such as local plugins or add-on that installed on the user desktop, anti-virus application, local hardware, etc. The meaning is a user mailbox that did not experience synchronization problems, until now or user who complains about the synchronization problem from time to time. The additional scenario could describe as “operative” Mailbox with synchronization problems. In case that the synchronization process fails, we will need to eliminate the cause, by finding the specific mail items, which cause the synchronization problem. (The synchronization process “direction” is from the local desktop to the cloud). For example, we create a new Mailbox (empty Mailbox) in Exchange Online, and we want to copy the data (mail items) from a PST file to the Exchange Online Mailbox. Many times we meet the synchronization problem when we need to upload data to the Exchange Online Mailbox. When dealing with “Outlook synchronization problems” there are two main scenarios: 1. This kind of Mailbox is good “candid” for synchronization problems, and require different “treatment” that involved hardware and archive solutions that will discussed later on. There is no official classification for a “Large Mailbox” (large OST file), but we can say that – if the Mailbox size is larger than 8 GB (and probably Mailbox that includes tens of thousands mail items), it could be described as: “Large Mailbox.” Large Mailboxīefore we begin the troubleshooting process, we should classify the Mailbox as Standard Mailbox or “Large Mailbox”. Mailbox and environments characters classification Standard vs. When using Exchange Online services, the communication channel is based on a WAN infrastructure, which by default, have narrow bandwidth vs. 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. 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). When using the term “Exchange Mailbox”, we are using an “alias” for a Database that hosted on the Exchange server. Instead of “fetching” the mail from the remote Mailbox, each time a user click on the mail item. ![]() Using a local copy of the Mailbox content should significantly improve the Outlook performance (response time) because access to the “data” (Mail items) created by using a local copy of the Mailbox that stored on the local drive. The meaning of “cache mode” is that Outlook client, will try to download all the Mailboxes content from the Exchange server to the local hard drive and save the information in a local Database (OST File). Part 1: Introduction Outlook Cache mode and the OST Databaseīy default, Outlook client is configured with the option of cache mode. So, in case that this is your scenario, the only advice that I can offer is: Be patient and read the information. I know that this article could consider as “long and tedious” but the Murphy law dictates that: most of the Outlook synchronization problem accrues to “VIP Users,” In this article, we review the cases and the troubleshooting steps for mitigating optional causes for Outlook synchronization problems in Office 365 environment and review the specific charters of Outlook and Exchange Online environment. ![]() The less good news is that there are many grounds for this issue, and there is no “magic” solution that will help us to solve the synchronization problem in “one click.” The good news is that we can solve this problem. ![]() ![]() Each time we open Outlook, the synchronization process start and stop in the middle, for some reason, we cannot figure. We try to use a couple of tricks (usually turn off and turn on windows), but no luck. One of our users complains that he cannot synchronize mail from his Mailbox in the cloud (Exchange Online).
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