Outlook 2016 Email not Indexing (The protocol handler Mapi16 cannot be loaded)

Tentative Fix (just waiting for reproducibility).

Open Indexing Options and note the number of items in the index. Edit Environment Variables and add to the path:

x32 - C:\Program Files\Microsoft Office\root\Office16\

or x64 - C:\Program Files (x86)\Microsoft Office\root\Office16\

Reboot, Open Indexing Options, note the items in the index, Open Outlook, Indexer starts working on items.

Seems Indexer needs Office in the %Path% in order to open the required files for MAPI16.

Note: On machines where Office 2016 installs correctly, the above path variable is not required, so it doesn't really fix the issue properly, but it does solve the problem in a reasonable manner.

I had this same issue and turns out the cause was adobe pdf pro add in. The add in does not install with office 2016 however it was inherited with office 2013. Disabling the add in then unchecking outlook from advanced. close outlook. rebuild index, checking then allowed indexing to occur again.

I had the same problem and I was using Office 2016 Small Business that was preinstalled on my Dell laptop. I removed Office entirely via the control panel and after that I used the removal tool from support.office.com. After that, I renamed all folders named 'Outlook' or 'Office' in the AppData subfolder of my profile to make sure the new installation did not reuse them. I reinstalled Office 2016 x64 by downloading it from Office.com. Now all my e-mail is indexed.

This is what I got from a case from Microsoft; Adding the path (#4) was what worked for me. Win 10/64; Office 2016 Pro Plus /32

1. Open file explorer -> C:\Windows\ProgramFiles

   • look for scanpst.exe.
   • Close outlook and run the tool

2. https://support.office.com/en-us/article/Outlook-search-stops-working-after-updating-to-build-7870-2020-and-higher-0bcf0b06-320d-40c3-8cf0-7e3df90793ed?ui=en-US&rs=en-US&ad=US

3. Check for Windows Updates

4. On the affected machine

   1. Go to Start > System
   2. Click Advanced System Settings
   3. Go to Advanced tab > Environment Variables > System Variables
   4. From the list, select Path
   5. Click Edit
   6. Check to see if the location of the MAPI protocol handler (mapiph.dll) is there. By default, it will be C:\Program Files\Microsoft Office\Root\Office16, as shown below. Notice that you can find mapiph.dll in this folder. REBOOT.
   7. If not, add the path to the value, with a semicolon separated. And click OK to save the change.

5. If only 1 users affected, please try to recreate the profile.

6. Follow steps from this link https://blogs.technet.microsoft.com/csstwplatform/2010/07/29/desktop-search-event-3083-window-search-mapi2handler-1-cannot-be-loaded

Also, a tech had added Reg. Key: Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Search DisableServerAssistedSearch DWORD value =1
I do not believe this was necessary, it seemed to be the path of the MAPI protocol handler (mapiph.dll) that resolved it. After a REBOOT.

Problem was Dixed December 2018 and occured again in January 2019 with Outlook 2016 version 1812. in Cache Mode

Extending path seems not to work for me, happend on Dell Image of Windows 10 updated to 1809 current Patchlevel as of 24.1.2019

What we figured out so far: Problem seems to happen in the Bridge between Windows Search x64 and Outlook mapi x32.

Quick Work Arround: Set Outlok Cache mode to not load all data, then you can search via Server by clicking on the search more line.

I had this problem on all brand new PCs (win10 20H2 x64). For initial setup I removed the preinstalled O365 (in diff languages) with the o15-ctrremove.diagcab, and here the problems starts:

1. In CONTROL PANEL a void "MAIL (OUTLOOK 2016)" icon
Delete the key

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID{A0D4CD32-5D5D-4f72-BAAA-767A7AD6BAC5}

OK!

2. MAPI 16 (HRESULT : 0x8007007e)

Go to HKEY_CLASSES_ROOT\CLSID{F8E61EDD-EA25-484e-AC8A-7447F2AAE2A9}

and HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID{F8E61EDD-EA25-484e-AC8A-7447F2AAE2A9}

and change the value

C:\Program Files\Microsoft Office\root\Office16\Interceptor.dll

with

C:\PROGRA~2\MICROS~2\Office16\MAPIPH.DLL

restart pc, now windows searh gives (HRESULT : 0x800700c1)

Delete the modified keys

HKEY_CLASSES_ROOT\CLSID{F8E61EDD-EA25-484e-AC8A-7447F2AAE2A9}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID{F8E61EDD-EA25-484e-AC8A-7447F2AAE2A9}

Last: remove from windows search the wrong context.

Close outlook,

Restart the PC and voilà! Indexing running in al my PCs!