Why convert ICS to PST?
ICS (RFC 5545) is a plain-text calendar format. A PST (Personal Storage Table) is a proprietary binary mailbox container introduced with Microsoft Outlook 97 that Outlook manages internally to hold an entire mailbox - emails, contacts, calendar items, and notes. You do not create a PST from a calendar file; Outlook adds imported calendar events to its existing PST as a side effect of the standard ICS import, making a separate converter unnecessary and meaningless.
How to convert ICS to PST
Microsoft Outlook APP
Go to File > Open & Export > Import an iCalendar (.ics) file - Outlook adds the events to your calendar and stores them in your existing PST automatically.
Birdie vCalendar / iCalendar Importer APP
Use Birdie vCalendar / iCalendar Importer to bring .ics calendar data into Outlook, where it is stored in your existing mailbox data file.
Programs that convert ICS
About these formats
.ICS
iCalendar data file
An ICS file is a calendar file in the iCalendar format (RFC 5545). It holds events, meeting invitations, tasks, and reminders as plain text. Double-click it to import into your default…
Open .ICS details →
.PST
Outlook Personal Storage Table
A PST file is a Microsoft Outlook database that stores an entire mailbox in one file - emails, contacts, calendar appointments, tasks, and notes. The standard way to open it is Microsoft…
Open .PST details →Quality & what to watch
- Importing an
.icsinto Outlook automatically adds events to your existing PST or Exchange/Microsoft 365 mailbox - no separate converter is needed. - After importing, back up the calendar items by exporting: File > Open & Export > Import/Export > Export to a file > Outlook Data File (.pst).
- Tools marketed as 'ICS to PST converters' typically use Outlook's standard import API - the same operation you can do for free.
Frequently asked questions
Can I open an ICS file directly in Outlook?
.ics file to add a single event, or use File > Open & Export > Import an iCalendar (.ics) file to import an entire calendar.I need my Outlook calendar as a PST file - how do I get one?
.ics into Outlook first, then export: File > Open & Export > Import/Export > Export to a file > Outlook Data File (.pst).
