To get calendar appointments out of an old PST file without Outlook, open the PST in a tool that reads Outlook data files directly and export the events as iCalendar (.ics) files, the standard format that Google Calendar, Outlook and Apple Calendar import. PstVault, a Windows app from Automata Labs, opens the PST read-only and exports calendar items as .ics with timed and all-day events, recurring series, deleted occurrences and time zones, and it reports any item it cannot convert. If you still have classic Outlook installed, its own Save Calendar command is the quicker way to move a whole calendar in one file.
This guide covers both routes, what Google Calendar does with the files, and the calendar details that do not survive any export.
Open the old PST, find the appointments, and export them as .ics files, without Outlook.
Get it from Microsoft
Why are appointments stuck in a PST?
A PST (Outlook Data File) holds more than mail. Microsoft’s support page on opening Outlook Data Files notes that archive PSTs can contain older email messages, calendar events and tasks. When a laptop is retired, a job ends or an account moves to another service, the PST is often the only copy of years of appointments: client meetings, site visits, hearing dates, service calls.
The usual reason people go looking is narrow. Someone needs to know when a meeting happened, rebuild a schedule for an invoice dispute, or move a few recurring events into a new calendar. Converting the whole mailbox is more than the job needs.
What is an .ics file?
An .ics file is an iCalendar file, defined by RFC 5545, the Internet standard for exchanging calendar data such as events, to-dos and free/busy information. Google’s help page on importing events describes the required shape: the file starts with BEGIN:VCALENDAR, holds each event between BEGIN:VEVENT and END:VEVENT, and ends with END:VCALENDAR.
Recurring meetings are written as a rule (RRULE) rather than as a list of copies. RFC 5545 says that when a rule has neither an end date (UNTIL) nor a count (COUNT), the series “is considered to repeat forever.” That detail matters below, because not every exporter handles every kind of series.
How do you export a PST calendar with classic Outlook?
If classic Outlook for Windows is installed, use it. Microsoft documents both steps:
- Open the PST. Select File, then Open & Export, then Open Outlook Data File, choose the .pst and select Open. The file appears in the folder pane, usually at the bottom.
- Save the calendar. In Calendar, select the calendar from that PST, then File, then Save Calendar. Under More Options, choose the date range (or Whole calendar) and the level of detail, then save. Microsoft’s guide to exporting an Outlook calendar to Google Calendar walks through the dialog and warns that a large range can make a large file that takes a while to generate.
The result is one .ics file for the whole calendar, which is ideal for a full move. The catch is that you need classic Outlook on the machine, set up with a profile, to do it.
How do you export a PST calendar without Outlook?
That is the case PstVault is built for. It opens the PST itself, so Outlook is not required and is never used:
- Open the PST. PstVault opens it read-only and shows the folder tree with message counts. The original file is never changed.
- Find the appointments. Open the calendar folder and use the text preview to check items. Filters by subject and words in the body help when you are looking for one client or one project.
- Choose Calendar (.ics). Select the events you need and export them as .ics. The Native files option goes further and picks EML, VCF or ICS for each item according to its type, so a mixed selection lands in the right formats.
- Read the report. Every export writes a JSON report that marks each item Complete, Partial, Failed or NotProcessed, with the SHA-256 of each output file.
The Microsoft Store listing describes calendar support precisely: supported events export to ICS “including finite Gregorian recurrences and deletions; unsupported semantics are rejected.” In practice that means a weekly meeting that ended, or ran a set number of times, exports as a series with its cancelled occurrences, while a series outside what PstVault supports is reported rather than silently converted into something wrong. Check the report before you rely on the files.
Export the appointments you need with a report of every item, and leave the PST exactly as it was.
Get it from Microsoft
Which route should you use?
| Situation | Better route | Why |
|---|---|---|
| Classic Outlook is installed and you want the whole calendar | Outlook Save Calendar | One .ics for the whole calendar and a date range picker |
| No Outlook on the PC, or you do not want to attach the PST to a mail profile | PstVault | Opens the PST directly and read-only |
| You need a handful of specific appointments | PstVault | Find and export only those items, with a report |
| You also need the emails and contacts from the same PST | PstVault | EML, PDF, HTML, vCard and CSV from the same window |
| An old ANSI PST (Outlook 97 to 2002) | Outlook or another tool | PstVault opens Unicode PST files only |
Our guide to what a PST file is explains Unicode and ANSI PSTs if you are not sure which you have.
How do you import the .ics into Google Calendar?
Google’s import help page gives the steps on a computer:
- Open Google Calendar and select Settings.
- Select Import & Export in the menu on the left.
- Select the file from your computer. It should end in .ics or .csv.
- Choose the calendar to add the events to (your primary calendar by default) and select Import.
Two points from the same page are worth knowing before you start:
- Import each .ics individually. Google says that if you have a .zip of .ics files, you take the individual files out and import each one. If your export produced several files, this is the step that takes time, so export only the events you need, or use Outlook’s Save Calendar for a full move.
- Guests and conference data are not imported. The event, time and description come across; the attendee list does not.
Google also says repeat events imported from a .csv file may arrive as a series of one-time events, which is one reason to prefer .ics over a spreadsheet for recurring meetings.
What does any calendar export lose?
Some calendar information does not travel well, whichever tool you use:
| Detail | What to expect |
|---|---|
| Attendees | Google does not import guests from an .ics file |
| Meeting links | Google does not import conference data |
| Reminders | Treat them as something to set again in the new calendar |
| Time zones | Kept in the .ics by PstVault; check one event in the new calendar to confirm the times look right |
| Open-ended series | A series with no end may be handled differently by different tools; check the report and the result |
If the goal is evidence of when something was scheduled rather than a working calendar, also export the matching emails (invitations and replies) as a PDF. Our guide to exporting emails from a PST file covers that, and the contacts page covers vCard and CSV exports from the same archive.
Frequently asked questions
Can I open a PST calendar without Outlook?
Yes, with a tool that reads PST files directly. PstVault opens Unicode PST files read-only and exports calendar items as .ics without Outlook installed.
Does Google Calendar accept .ics files?
Yes. Google Calendar imports .ics and .csv files from a computer through Settings, then Import & Export. Google says to import each .ics file individually.
Will recurring meetings stay recurring?
In an .ics, a series is stored as a rule. PstVault exports supported series, including finite Gregorian recurrences and deleted occurrences, and rejects and reports what it does not support.
Does PstVault open OST files?
No. It opens PST files only. It does not repair damaged archives or decrypt encrypted messages.
Will exporting change my PST?
No. PstVault opens the PST read-only and writes new files without overwriting existing ones.
Try PstVault
PstVault is a one-time purchase in the Microsoft Store with a free trial. Open the old archive, export a few appointments, and import one file into your calendar before you buy. More detail is on the PstVault product page.
Get appointments, contacts and emails out of an old PST, on your PC, with nothing uploaded.
Get it from Microsoft
Outlook is a trademark of the Microsoft group of companies, and Google Calendar is a trademark of Google LLC. PstVault is not affiliated with either.
Last updated 20 October 2026. Published by Automata Labs, a software company in Canada.