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Creating new items using EWS vs WEBDAV. Need help.

Hi,

We are migrating from Exchange 2003 to 2010 and as part of this migration I need to update some clientside c# apps which update/create calendar appointments in Exchange.

These apps were using WEBDAV and HTTP/XML requests to update Exchange. I understand I need to convert these apps to use the managed EWS API. I have downloaded some code samples from the Microsoft site and have these working but I need a understanding of how to uniquely identify these appointments so I can update/create them from a local database.

In the current apps when creating the HHTP request the URI would contain the ID to create the appointment :

http://mymailserver/exchange/username/calendar/12345.eml

12345 would be the ID from the local database to identify the appointment.

Now my question is how do I go above achieving the same results using EWS ? There are already 100s of appointments in our exchange server in this format so when I upgrade I still need to identify the appointment in the same way.

I would love some help with this as I only have just over a week to update the current applications!
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chriscboy
Asked:
chriscboy
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chriscboyAuthor Commented:
Further to the above, below is an example of how I am creating/updating the appointments in the client apps :

http://msdn.microsoft.com/library/office/ms877306(v=exchg.65).aspx

The main difference is with the appointment item :

 ' Appointment item.
 strApptItem = "testappointment.eml"

I am setting to a unique id from a database e.g.  strApptItem = "12345.eml"
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LeeDerbyshireCommented:
When you create the item in EWS, its unique Id is returned. Your best option would be to store that in your database, and use that to retrieve it later. Note that if the appointment gets moved, the Id may change.

Another option (possibly more reliable) is to add a custom property, and search for that when you want to do an update on it.
http://msdn.microsoft.com/en-us/library/dd633654(v=exchg.80).aspx
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