The processing interval specifies how often Add2Exchange synchronizes relationships. Each type of relationship has its own processing interval.
This is a photo of the Processing Interval Settings for Add2Exchange Enterprise:
Add2Exchange Enterprise Service Utility
And here is a photo of the Processing Interval Settings for Add2Exchange Standard:
Add2Exchange Standard Service Utility
On installation the default Synchronization Interval option is set for 30 minutes for each folder type. This means the Add2Exchange Service will wait 30 minutes between attempts to synchronize each module (calendars, contacts and tasks). Regardless of how long the Synchronization Interval is specified here, Add2Exchange will do an immediate synchronization once the Add2Exchange Service is started. The Console will warn against making a relationship if you set the Synchronization Interval to less than 5 minutes.
The Synchronization Intervals are set separately for each module. They are overlapping, which means timers run for all three modules simultaneously. If the intervals are all set to the same interval, Add2Exchange will try to run after the same amount of time expires. Rather than run multiple synchronizations at the same time, Add2Exchange resolves this by running modules in order from calendars to Contacts to Tasks. This means modules will wait until they have a chance to run separately. If Add2Exchange is already synchronizing it will put an event in the Add2Exchange Event log that it has not finished yet synchronizing the prior task.
For this reason, the exact time intervals may run is inexact. Because one module may not be done synchronizing when another tries to run, it may "bump" the other while it completes. This means you cannot always guarantee the schedule for a synchronization to always run at the exact same time, for example, unless you are only running one module or you arrange the Synchronization Intervals to be longer than the longest time it takes to synchronize so they don't expire at the same time.
Tip: A very short Synchronization Interval is extremely undesirable, because Add2Exchange will always be synchronizing. It can also be a problem when users open up items and keep them open. It is recommended you set the Synchronization Interval to at least 4 times as long as it takes for a synchronization to complete so you are not synchronizing more than 25% of the time.
Tip: Have the Synchronization Interval as long as possible to conserve your computer and network resources. Common values are every 10 minutes, 30 minutes, hourly, and once a day. This will depend on the speed of your computer, whether it was installed on the Exchange Server, the number of relationships you set up, how many days are included in each relationship and the actual amount of items in the folders.
We suggest at least 30 minutes for the minimum interval for calendars, an hour for Tasks and for Contacts, a much longer interval, such as once or twice a day. Budget about 30 seconds per relationship thereafter but usually synchronization occurs much faster. For 20 relationships, we recommend every 30 minutes, for 40 relationships every 60. It will take significantly longer the first synchronization than successive synchronizations. The speed of your synchronization depends on many factors (in order): the speed of the server, amount of RAM, whether it is installed on the Exchange Server or not, the amount of information synchronized and the amount of relationships.
Tip: If you are not using a particular type of folder synchronization, you can effectively disable synchronization of that folder type by setting the Interval to several days, months or years.
By design, Add2Exchange will not run the synchronization process while the prior synchronization is still running, and if the Synchronization Interval is too short, the Windows Event log will fill up with items stating this fact. To eliminate these items, lengthen the Synchronization Interval.
To find out how long Add2Exchange takes to synchronize calendars, contacts and tasks, within the console, set the Add2Exchange logging to Start and Stop and then let Add2Exchange synchronize at least 2 cycles. Open the Add2Exchange Event log and read the second (most recent) set of Success Logs for each folder type. This event summarizes how long it takes for each type of folder to synchronize. Note that the events you are reading say Process ID: calendars, contacts and tasks and not the Add2Exchange Service. The event log for the Add2Exchange Service will measure the amount of time between when the Add2Exchange Service was started and stopped and can contain several synchronizations.
Tip: To optimize time even further, select "No logging" in the Service Utility under normal operation of Add2Exchange.
Add2Exchange automatically stops the Add2Exchange Service when the Add2Exchange Console is opened and gives you the option to start the Add2Exchange Service when you exit. If you don't start the Add2Exchange Service, it will not synchronize. Opening up the Add2Exchange Console resets the Synchronization Interval. Remember, the Add2Exchange Service will start immediately and do an initial synchronization 30 seconds later and will run on the scheduled interval thereafter.
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