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The OST 2013/2016 file format is not supported for this method


I am just starting a new project, we want to synchronize appointments, tasks and contacts with Outlook from our software. Currently this works with Office Automation, but is very slow. Now I want to change this to Aspose.Email. On my development machine I have several accounts, all are set up as IMAP and store the data in ost format. Reading appointments works very well and fast, however when I try to write an appointment with this code

MapiCalendar appo = new MapiCalendar(“Location”, “Summary”, “Description”, DateTime.Now, DateTime.Now.AddHours(1));
retVal = folderInfo.AddMapiMessageItem(appo);

I get the following exception: “The OST 2013/2016 file format is not supported for this method.”
Is there any way to save appointments,… in this file format or what is the best way to do this?

Best thanks


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